Life Imitates Comic Books
Here's a somewhat wacky story about a new proposal
:The old circus trick of firing a person from a cannon is being considered by the US Defence Advanced Research Projects Agency (DARPA) as a way to get special forces, police officers and fire fighters onto the roofs of tall buildings in a hurry.
Of course, way back in 1940, another man had the same idea:
Hat Tip: Neander News